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      <p>
    There are a number of functions that flush pages from the Berkeley DB shared memory buffer pool
    to disk.  Most of those functions can potentially fail because a page that needs to be flushed
    is not currently available.  However, this is not a hard failure and is rarely cause for
    concern.  In the Berkeley DB 3.2 release, the C++ API (if that API is configured to throw
    exceptions) and the Java API have been changed so that this failure does not throw an exception,
    but rather returns a non-zero error code of <code class="literal">DB_INCOMPLETE</code>.
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      <p>
    The following C++ methods will return <code class="literal">DB_INCOMPLETE</code> rather than throw 
    an exception: 
    <a href="../api_reference/CXX/dbclose.html" class="olink">Db::close</a>,
    <a href="../api_reference/CXX/dbsync.html" class="olink">Db::sync</a>,
    <a href="../api_reference/CXX/mempsync.html" class="olink">DbEnv::memp_sync</a>,
    <a href="../api_reference/CXX/txncheckpoint.html" class="olink">DbEnv::txn_checkpoint</a>,
    and <a href="../api_reference/CXX/mempfsync.html" class="olink">DbMpoolFile::memp_fsync</a>.
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      <p>
    The following Java methods are now declared "public int" rather than "public void", and will
    return <code class="literal">Db.DB_INCOMPLETE</code> rather than throw an exception: 
    <code class="methodname">Db.close()</code>, <code class="methodname">Db.sync()</code>, and
    <code class="methodname">DbEnv.checkpoint()</code>.
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      <p>
    It is likely that the only change required by any application will be those currently checking
    for a <code class="literal">DB_INCOMPLETE</code> return that has been encapsulated in an exception.
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